The Blob interface represents a blob, which is a file-like object of immutable, raw data; they can be read as text or binary data, or converted into a ReadableStream so its methods can be used for processing the data. Blobs can represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on
![Blob - Web APIs | MDN](https://cdn-ak-scissors.b.st-hatena.com/image/square/aa767575b4232d312d2c5de428f0bf0955805e26/height=288;version=1;width=512/https%3A%2F%2Fdeveloper.mozilla.org%2Fmdn-social-share.cd6c4a5a.png)